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by Mike
Mon Sep 18, 2017 9:03 am
Forum: Programming
Topic: 4ty - 40x25 interlaced text mode on unexpanded VIC 20
Replies: 15
Views: 490

Re: 4ty - 40x25 interlaced text mode on unexpanded VIC 20

You're right, I only need 2k for the charmap as the source map will reside bin bank 3 as it does today with the C64 font.. A full (i.e. 256 characters) single-height character set for the VIC chip requires 2K. If you ever plan to use a full double-height character set, that requires 4K and you have...
by Mike
Mon Sep 18, 2017 7:36 am
Forum: Programming
Topic: 4ty - 40x25 interlaced text mode on unexpanded VIC 20
Replies: 15
Views: 490

Re: 4ty - 40x25 interlaced text mode on unexpanded VIC 20

Once again, how you organize the character definitions as such, and how you provide character generator data to VIC-I are two entirely different matters. From the diagram I'd conclude you plan to put the upper/graphics PETSCII set into the upper nibbles of the character definitions, and the lower/up...
by Mike
Mon Sep 18, 2017 5:35 am
Forum: Programming
Topic: 4ty - 40x25 interlaced text mode on unexpanded VIC 20
Replies: 15
Views: 490

Re: 4ty - 40x25 interlaced text mode on unexpanded VIC 20

For NinjaTerm I would use a full screen bitmap with 8x16 chars, but arranged and wrapped around in a way so that you can scroll the screen very fast. Odd lines can be scrolled up by just changing the value of screen y-position and wiping the top line (8-high). Even lines can be then scrolled up by ...
by Mike
Mon Sep 18, 2017 3:50 am
Forum: Programming
Topic: 4ty - 40x25 interlaced text mode on unexpanded VIC 20
Replies: 15
Views: 490

Re: 4ty - 40x25 interlaced text mode on unexpanded VIC 20

What program did you make that with? I made this with an assorted set of my own tools, mostly C programs: One of them produces a *.pgm file from a text file, using the glyphs of an own font to display 7-bit ASCII. This font has also been used in several other applications, also by other people. It'...
by Mike
Sun Sep 17, 2017 2:06 am
Forum: Collecting and History
Topic: Two VIC-20 Releases for Gubbdata 2017 ...
Replies: 1
Views: 95

Two VIC-20 Releases for Gubbdata 2017 ...

... by Mermaid /GP: splorf_the_hero.zip castle__-mermaid.zip ... as found on scene.org in "/other_gfx" and "/other_music". "Castle" was most probably done in Aleksi Eeben's Picasso, and provided as executable file for unexpanded VIC-20. It made #2 in the compo. "Sp...
by Mike
Sat Sep 16, 2017 12:44 pm
Forum: Programming
Topic: 4ty - 40x25 interlaced text mode on unexpanded VIC 20
Replies: 15
Views: 490

Re: 4ty - 40x25 interlaced text mode on unexpanded VIC 20

reply.zip
(1.48 KiB) Downloaded 10 times

:mrgreen:
by Mike
Sat Aug 26, 2017 10:46 am
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 794

Re: Raster split and $9002

tokra wrote:(are you listening, Mike?)

Yes.

...

:lol:

(... > off to continue with the new raster paper ... ;) )
by Mike
Sat Aug 26, 2017 2:51 am
Forum: Programming
Topic: 320x200 - a CGA emulator for VIC-20! (+35K RAM req'd)
Replies: 6
Views: 595

Re: 320x200 - a CGA emulator for VIC-20! (+35K RAM req'd)

This would have been a good starting point for my "VIC Hunt"-picture [...] Though it becomes quite cumbersome and confusing to edit the picture in the zoomed view of both fcbpaint and MINIPAINT. Starting from this converted picture ... 01_splatoon.png ... you'll only ever get to see (and ...
by Mike
Fri Aug 25, 2017 2:02 pm
Forum: Programming
Topic: 320x200 - a CGA emulator for VIC-20! (+35K RAM req'd)
Replies: 6
Views: 595

Re: 320x200 - a CGA emulator for VIC-20! (+35K RAM req'd)

This is still a work in progress, and a converter from 4 colour *.ppm files is in the works. Found time this evening to give it a try. Here's a new example picture: splatoon.zip :mrgreen: The converter takes a full-colour 320x200 *.ppm file and does a full optimization for the best 4 colour palette...
by Mike
Thu Aug 24, 2017 2:45 pm
Forum: Hardware and Tech
Topic: Odd Issue: Freezes/Unfreezes When Bumped
Replies: 10
Views: 174

Re: Odd Issue: Freezes/Unfreezes When Bumped

Does anyone here happen to have any thoughts? You can check if there's 'just' something fishy with the IRQ line or if the VIC-20 freezes whole by starting up the following small program, while it's still working: 1 PRINTX,TI:X=X+1:GOTO1 RUN Then 'whack' your VIC-20 (in the hope to trigger the error...
by Mike
Thu Aug 24, 2017 2:14 pm
Forum: Emulation and Cross Development
Topic: Emulation problems with Power-20 (split from: "WIP: Arukanoido")
Replies: 8
Views: 132

Re: Emulation problems with Power-20 (split from: "WIP: Arukanoido")

Paddle sets joystick left. Light pen sets joystick left and right. Strange... BTW Power20 includes a 1351 emulation, funny. Neither of these three use cases show sensible behaviour in Power-20. On real h/w: - the paddles for sure assert two of the joystick lines *when* their fire buttons are presse...
by Mike
Thu Aug 24, 2017 11:46 am
Forum: Programming
Topic: Robo-VIC: An Android Inspired GUI
Replies: 15
Views: 325

Re: Robo-VIC: An Android Inspired GUI

I wrote a quick memory configurator for Ultimem last night and saw a consistent behavior. When I applied a value to the registers and the Ultimem was there, leaving the program resulted in a soft-boot with the correct configuration. When I didn't have Ultimem in place, the program just drops back t...
by Mike
Thu Aug 24, 2017 9:48 am
Forum: Programming
Topic: Robo-VIC: An Android Inspired GUI
Replies: 15
Views: 325

Re: Robo-VIC: An Android Inspired GUI

Is there a way to safely detect the presence of the Ultimem? No. Any inconsiderate accesses to I/O 2 or I/O 3 by 3rd party software, regardless whether these are writes or reads(!), can lead to unforeseeable effects depending on which cartridge is connected. IMO, the only legit user of the I/O area...
by Mike
Wed Aug 23, 2017 12:03 pm
Forum: General Topics
Topic: VIC Hunt - fcbpaint-image released at Evoke 2017
Replies: 6
Views: 189

Re: VIC Hunt - fcbpaint-image released at Evoke 2017

The picture made a good #8 out of 26 entries in the competition. :)
by Mike
Wed Aug 23, 2017 11:24 am
Forum: Emulation and Cross Development
Topic: Emulation problems with Power-20 (split from: "WIP: Arukanoido")
Replies: 8
Views: 132

Re: Emulation problems with Power-20 (split from: "WIP: Arukanoido")

Indeed, left is always set. I wonder why it works at all but Arukanoido. You should now cross check like thus: 1. replace 37137 in the test programm with 37151 to confirm (in Power-20) the joystick routine indeed works as intended with the other register, and 2. in my Games Collection , start the g...

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